From the Authors readme...

HS_Power_Pole_Pack [prop_static]

(HS_PP_Pack just doesn't sound right)
Released: March 15, 2008
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Installation:

steam/steam apps/(Account Name)/day of defeat source/dod/
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Credits:
Myself (Heavily Sedated)
The many websites dedicated to insulators and other power related utilities.
And VALVe, I used the stock utility pole to get the size right on these.
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Permission to use for any source mod, just remember to give me credit.
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(See download for email)